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BUG: KASAN: slab-out-of-bounds in dns_resolver_preparse+0xa98/0xaf8 net/dns_resolver/dns_key.c:127
Read of size 1 at addr ffff0000dbbc3704 by task syz-executor.0/10327
CPU: 1 PID: 10327 Comm: syz-executor.0 Not tainted 5.15.146-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call trace:
dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x174/0x1e4 mm/kasan/report.c:451
__asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306
dns_resolver_preparse+0xa98/0xaf8 net/dns_resolver/dns_key.c:127
key_create_or_update+0x43c/0xa38 security/keys/key.c:861
__do_sys_add_key security/keys/keyctl.c:134 [inline]
__se_sys_add_key security/keys/keyctl.c:74 [inline]
__arm64_sys_add_key+0x440/0x578 security/keys/keyctl.c:74
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Allocated by task 10327:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc+0xbc/0xfc mm/kasan/common.c:513
__kasan_kmalloc+0x10/0x1c mm/kasan/common.c:522
kasan_kmalloc include/linux/kasan.h:264 [inline]
__kmalloc_node+0x2c0/0x5b8 mm/slub.c:4455
kmalloc_node include/linux/slab.h:614 [inline]
kvmalloc_node+0x88/0x204 mm/util.c:619
kvmalloc include/linux/mm.h:805 [inline]
__do_sys_add_key security/keys/keyctl.c:116 [inline]
__se_sys_add_key security/keys/keyctl.c:74 [inline]
__arm64_sys_add_key+0x29c/0x578 security/keys/keyctl.c:74
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Last potentially related work creation:
kasan_save_stack+0x38/0x68 mm/kasan/common.c:38
kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348
kvfree_call_rcu+0xb8/0x684 kernel/rcu/tree.c:3596
sctp_inet6addr_event+0x5a8/0x62c net/sctp/ipv6.c:115
notifier_call_chain kernel/notifier.c:83 [inline]
atomic_notifier_call_chain+0x174/0x2a0 kernel/notifier.c:198
inet6addr_notifier_call_chain+0x30/0x40 net/ipv6/addrconf_core.c:109
addrconf_ifdown+0xdf0/0x1814 net/ipv6/addrconf.c:3886
addrconf_notify+0x350/0xc58
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:391
call_netdevice_notifiers_info net/core/dev.c:2018 [inline]
call_netdevice_notifiers_extack net/core/dev.c:2030 [inline]
call_netdevice_notifiers net/core/dev.c:2044 [inline]
dev_close_many+0x2fc/0x468 net/core/dev.c:1619
unregister_netdevice_many+0x408/0x189c net/core/dev.c:11066
unregister_netdevice_queue+0x2d0/0x31c net/core/dev.c:11023
unregister_netdevice include/linux/netdevice.h:3012 [inline]
__tun_detach+0xb74/0x12b0 drivers/net/tun.c:685
tun_detach drivers/net/tun.c:701 [inline]
tun_chr_close+0x118/0x20c drivers/net/tun.c:3434
__fput+0x30c/0x7f0 fs/file_table.c:280
____fput+0x20/0x30 fs/file_table.c:308
task_work_run+0x130/0x1e4 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
do_notify_resume+0x262c/0x32b8 arch/arm64/kernel/signal.c:946
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:609
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
The buggy address belongs to the object at ffff0000dbbc3700
which belongs to the cache kmalloc-128 of size 128
The buggy address is located 4 bytes inside of
128-byte region [ffff0000dbbc3700, ffff0000dbbc3780)
The buggy address belongs to the page:
page:00000000ae660f42 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11bbc3
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 fffffc0003067d40 0000000500000005 ffff0000c0002300
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff0000dbbc3600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000dbbc3680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000dbbc3700: 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff0000dbbc3780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff0000dbbc3800: 05 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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